2019 LEXUS RX350 engine

234 4-2. Driving procedures
RX350/RX350L_U ■
If the electronic key battery is depleted
 P. 623 ■
Operation of the engine switch ●
If the switch is not pressed shortly and firmly, the engine switch mode may not change
or the engine may not start. ●
If attempting to restart the engine immediately after turning the engine switch off, the
engine may not start in some cases. After turning the engine switch off, please wait a
few seconds before restarting the engine. ■
If the smart access system wi th push-button start has been deactivated by a customized
setting
 P. 684
WARNING ■
When starting the engine
Always start the engine while sitting in the driver’s seat. Do not depress the accelerator
pedal while starting the engine under any circumstances.
Doing so may cause an accident resu lting in death or serious injury.■
Caution while driving
If engine failure occurs while the vehicle is moving, do not lock or open the doors until
the vehicle reaches a safe and complete stop. Activation of the steering lock in this cir-
cumstance may lead to an accident, re sulting in death or serious injury.■
Stopping the engine in an emergency
If you want to stop the engine in an emergency while driving the vehicle, press and hold
the engine switch for more than 2 seconds, or press it briefly 3 times or more in succes-
sion. (  P. 645)
However, do not touch the engi ne switch while driv ing except in an emergency. Turning
the engine off while driving will not cause lo ss of steering or braking control, but the
power assist to these systems will be lost. Th is will make it more difficult to steer and
brake, so you should pull over and stop the vehicle as soon as it is safe to do so.

2354-2. Driving procedures
4
Driving
RX350/RX350L_U NOTICE ■
To prevent battery discharge ●
Do not leave the engine switch in AC CESSORY or IGNITION ON mode for long
periods of time without the engine running. ●
If “ACCESSORY” or “IGNITION ON” is displa yed on the meters while the engine is
not running, the engine switch is not off. Exit the vehicle after turning the engine
switch off. ●
Do not stop the engine when the shift lever is in a position other than P. If the engine is
stopped in another shift lever position, the engine switch will no t be turned off but
instead be turned to ACCESSORY mode. If the vehicle is left in ACCESSORY
mode, battery discharge may occur. ■
When starting the engine ●
Do not race a cold engine. ●
If the engine becomes difficult to start or stalls frequently, have your vehicle checked
by your Lexus dealer immediately. ■
Symptoms indicating a malfun ction with the engine switch
If the engine switch seems to be operating somewhat differen tly than usual, such as the
switch sticking slightly, ther e may be a malfunction. Contact your Lexus dealer immedi-
ately.

236 4-2. Driving procedures
RX350/RX350L_U While the engine switch is in IGNITION ON mode, move the shift lever
with the brake pedal depressed. When shifting the shift lever between P and D, make sure that the vehicle is
completely stopped.
* 1
: Shifting to the D position allows the system to select a gear suitable for the driving
conditions. Setting the shift lever to the D position is recommended for normal driv-
ing.
* 2
: Selecting shift ranges using S mode restricts the upper limit of the possible gear
ranges, controls engine braking forces , and prevents unne cessary upshifting.Automatic transmission (vehicles without paddle
shift switches) Shifting the shift lever
Shift position purpose Shift position Objective or function
P Parking the vehicle/starting the engine
R Reversing
N Condition in which the power is not transmission
D Normal driving
* 1
S S mode driving
* 2
(  P. 237)

2374-2. Driving procedures
4
Driving
RX350/RX350L_U  P. 373
To enter S mode, shift the shift lever to the S position. The shift range can then be
selected by operating the shift lever. Ch anging the shift range allows restriction
of the upper limit of the gears to be us ed, preventing unnece ssary upshifting and
enabling the level of engine br aking force to be selected.
Upshifting
Downshifting The initial shift rang e in S mode is set
automatically between 3 and 7 accord-
ing to vehicle speed and driving condi-
tions.
■
Shift ranges and their functions
A lower shift range will provide greater engi ne braking forces than a higher shift
range.Selecting the driving mode
Selecting shift ranges in S mode 1
2
Meter display Function
S2 - S8 A gear in the range between 1 and the selected gear is auto-
matically chosen depending on vehicle speed and driving
conditions
S1 Setting the gear at 1

238 4-2. Driving procedures
RX350/RX350L_U ■
S mode ●
When the shift range is 6 or lower, holding th e shift lever toward “+” sets the shift range
to 8. ●
To prevent the engine from over-revving, upshifting may automatically occur. ●
To protect the automatic transmission, a functi on is adopted that au tomatically selects a
higher shift range when the fluid temperature is high. ■
To protect the automatic transmission
If the automatic transmission fluid temperat ure is high, “Transmission Fluid Temp High
See Owner’s Manual” will be displayed on the multi-information display and the vehicle
will go into transmission protection mode automatically. Have th e vehicle inspected by
your Lexus dealer. ■
Downshifting restrictions warning buzzer
To help ensure safety and driving performance, downshifti ng operation may sometimes
be restricted. In some circum stances, downshifting may not be possible even when the
shift lever is operated. (A buzzer will sound twice.) ■
When driving with dynamic radar cruise control with full-speed range activated
Even when performing the following actions with the intent of enabling engine braking,
engine braking will not occur because dynamic radar cruise control with full-speed
range will not be canceled. ●
While driving in D or S mode, downshifting to 7, 6, 5 or 4. (  P. 300)●
When switching the driving mode to spor t mode while driving in the D position
(  P. 373)■
Restraining sudden start (Drive-Start Control)
When the following unusual operation is performed, the engine output may be
restrained. ●
When the shift lever is shifted from R to D, D to R, N to R, P to D, or P to R (D includes S)
with the accelerator pedal depressed, a wa rning message appears on the multi-infor-
mation display. If a warning message is shown on the multi- information display, read the
message and follow the instructions. ●
When the accelerator pedal is depressed too while the vehicle is in reverse. ■
Shift lock system
The shift lock system is a system to prevent ac cidental operation of the shift lever in start-
ing.
The shift lever can be shifted from P only when the engine switch is in IGNITION ON
mode and the brake pedal is being depressed.

2394-2. Driving procedures
4
Driving
RX350/RX350L_U ■
If the shift lever cannot be shifted from P
First, check whether the brak e pedal is being depressed.
If the shift lever cannot be shifted with your foot on the brake pedal, there may be a prob-
lem with the shift lock system. Have the vehi cle inspected by your Lexus dealer immedi-
ately.
The following steps may be used as an emergency measure to ensure that the shift lever
can be shifted.
Releasing the shift lock:
Turn the engine switch to IGNITION ON mode and check that the parking brake is
set. (  P. 232, 247)
Turn the engine switch to off.
Depress the brake pedal.
■
AI-SHIFT
The AI-SHIFT automatically se lects the suitable gear according to driver performance
and driving conditions.
The AI-SHIFT automatically operates when the sh ift lever is in D. (Shifting the shift lever
to the S position cancels the function.) 1
2
3
Pry the cover up with a flathead screwdriver
or equivalent tool.
To prevent damage to the cover, cover the tip
of the screwdriver with a rag.
Press the shift lock override button.
The shift lever can be shifted while the button
is pressed
WARNING ■
When driving on slippery road surfaces
Be careful of downshifting an d sudden acceleration, as this could result in the vehicle
skidding to the side or spinning. ■
To prevent an accident wh en releasing the shift lock
Before pressing the shift lock override butto n, make sure to set the parking brake and
depress the brake pedal.
If the accelerator pedal is accidentally depressed instead of the brake pedal when the
shift lock override button is pressed and the shift lever is shifted out of P, the vehicle
may suddenly start, possibly leading to an a ccident resulting in death or serious injury.4
5

240 4-2. Driving procedures
RX350/RX350L_U While the engine switch is in IGNITION ON mode, move the shift lever
with the brake pedal depressed. When shifting the shift lever between P and D, make sure that the vehicle is com-
pletely stopped.
* 1
: Shifting to the D position allows the system to select a gear suitable for the driving
conditions.
Setting the shift lever to the D positi on is recommended for normal driving.
* 2
: Selecting gears using M mode fixes the gear step, controls engine braking force, and
prevents unnecessa ry upshifting.Automatic transmission (ve hicles with paddle shift
switches) Shifting the shift lever
Shift position purpose Shift position Objective or function
P Parking the vehicle/starting the engine
R Reversing
N Condition in which the power is not transmission
D Normal driving
* 1
M M mode driving
* 2
(  P. 242)

2414-2. Driving procedures
4
Driving
RX350/RX350L_U  P. 373
To drive using temporary shift range selection, operate the “-” or “+” paddle shift
switch.
When the “-” paddle shift switch is oper ated, the shift range will be downshifted
to a range that enables engine braking forc e that is suitable to driving conditions.
When the “+” paddle shift switch is operated, the shift range will be one gear
higher than the gear in use during normal D position driving.
Changing the shift range allows restrictio n of the highest gear, preventing unnec-
essary upshifting and enabling the level of engine braking force to be selected.
Upshifting
Downshifting The selected shift rang e, from D1 to D8,
will be displayed on the meters.
■
Shift ranges and their functions
A lower shift range will provide greater engi ne braking forces than a higher shift
range.Selecting the driving mode
Selecting shift ranges in the D position 1
2
Meter display Function
D2 - D8 A gear in the range between 1 and the selected gear is auto-
matically chosen depending on vehicle speed and driving
conditions
D1 Setting the gear at 1